Abstract
We investigate deformation twinning in a highly textured magnesium alloy plate of Mg-3.1%Al-0.9%Zn-0.4%Mn under edge-on impact with in situ, synchrotron-based, ultrafast X-ray diffraction measurements, and corresponding stress states are simulated with the finite element method. Deformation twinning and its anisotropy under the triaxial stress condition are explained by a statistical analysis of resolved shear stress. The critical resolved shear stress criterion is applicable under complicated stress conditions induced by high strain rate impact loading. Three typical simple stress conditions are further explored as verification and application cases: uniaxial-stress, uniaxial-strain, and plane-stress. Extension twinning in the magnesium alloy is prone to occur for impact loading applied perpendicular to the crystallographic c-axis, regardless of the exact stress conditions.
Original language | English (US) |
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Article number | 141360 |
Journal | Materials Science and Engineering: A |
Volume | 818 |
DOIs | |
State | Published - Jun 22 2021 |
Funding
This work was sponsored in part by the Scientific Challenge Project of China (Grant No. TZ2018001 ) and the National Natural Science Foundation of China (Grant Nos. 11627901 and 11902274 ). Use of the Advanced Photon Source, an Office of Science User Facility operated for the US Department of Energy (DOE) Office of Science by Argonne National Laboratory, was supported by the US DOE under Contract No. DE-AC02-06CH11357 .
Keywords
- Deformation twinning
- Impact loading
- Magnesium alloys
- Resolved shear stress
- Transient X-ray diffraction
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering